I'm looking for a port free or port less carbon fiber or titanium barrel. Essentially I'm looking for light weight and efficient barrels. I want a port free barrel for wet confitions and better efficiency allowing my to overbore to say a .693

i really like the Stiffi Metal Free barrels they come in a lot of different bore sizes they are cheaper then most or all other carbon fiber barrels. much lighter and quieter due to not having any metal in them i believe they are ported any where from .679 to .695 all have a 5 inch control board in them. i use a .683 but im going to buy a few more. i use them on my Etek3 and my blitz talk about a whole lot quieter. i can only imagine how it would sound on a spooli or an autococker.